Grinding machine



l. MATHEWSON GRINDING MACHINE Feb. 23, 1932.

Original Filed July 19 1927 5 Sheets-Sheet E Il l-x Il.. ULI

FIC; 1

INVENTUR /wf LM 4M A TrnR NE Ys Feb. 23, 1932. M, MATHEWSQN 1,846,132

GRINDING MACHINE original Filed July 19, 1927 5 sheets-sheet 2 F/GZ INENTCI/IIV Aww@ M ATFURNEYS Fel). 23, 1932,

M. l. MATHEWSON GRINDING MACHINE Original Filed July 19, 1927 F/GE 3Sheets-Sheet 3 ATrDRNEYS Patented Feb. 23, 1932 y UNITED STATES PATENTOFFICE,

:MAXWELL I. MATHEWSON, 0F PROVOIDENCE, RHODE ISLAND, ASSIGNOB T0 BROWN QSHARPE MANUFACTURING COMPANY, .A CORPORATION OF RHODE I GRINDING MACHINEDriginal application led July 19, 1927, Serial No. 206,917. Divided andthis application med December 24, 1930.I Serial No. 504,553.

The present invention relates to grinding machines, and more articularlyto means for protecting certain o the parts from thewater or emulsionwhich is necessarily used in the grinding operation. The invention, asherein disclosed, is embodied in a type of machine in which the grindingwheel is mountu ed on a carriage to move toward and away from the work,and the work is mounted on a work supporting table movable back andforth longitudinally of the grinding wheel spindle. In order to catchthe water or emulsion which is poured onto the point of contact of thegrinding wheel and the work, a trough is provided between the wheelspindle carriage and the work table.

In carrying out the present invention, a novel and improved arrangementof water guards has been provided to protect the wheel spindle carriageways and other parts of the machine from contact with the grindingemulsion. lThese guards are simply and eiiiciently designed to conformto the contours of the machine, to extend adequately over the surface tobe covered as the wheel spindle carriage is moved away along its slide,and to collapse readily into a small space as the carriage is returnedtoits limiting position at the near end of the slide.

The several features of the invention will be readily understood by oneskilled in the art from the following description taken in connectionwith the accompanying drawings in which Fig. l is a view in right sideelevation of the machine, only so much thereof being shown as isnecessary to show the connection of the present invention there.

with; Fig. 2 is a more detailed view taken in left side elevation on alarge scale; and Fig. 3 is a similar view in right elevation on a largescale.

For a more complete disclosure of the machine, and for a completedescription thereof, reference may be had to the inventors pendingapplication, Serial No. 206,917, filed July 19, 1927, of which thepresent application is a division.

Referring to the drawings, the machine illustrated comprises a frame 12on the front portion of which is mounted a work supporting table 14,which is adapted for transverse movement on ways 16, and is providedwith a head stock 18, and a foot stock. A rotary grinding wheel isindicated at 22, secured to a. wheel spindle 24 0n the wheel spindlecarriage 26, which is mounted on ways 28 on the rear portion of theframe to slide towards and away from the work. The grinding wheelspindle 24; is driven from a drive shaft 30 mounted in the base of themachine by means of a belt 32 which passes over a pulley 34 on the wheelspindle 24 and under the idler pulley 36 and take-up pulley 38 in thebase ofthe machine and around a pulley 40 on the drive shaft 80. Anelectric motor 42 acting through a belt 4:4 supplies the drivingimpct-us to the drive shaft 30. A water trough 46 is formed in themachine frame 12 between the' work support and the wheel spindlecarriage to drain off the water which is continuously poured over thework during the grinding operation.

In grinding metal surfaces with grinding wheels having high peripheralspeeds, it is necessary to keep a. continual flow of water, or somegrinding emulsion, on the point of contact between the metal and thegrinding surface to prevent overheating of the parts and to insure asmooth and efficient abrading actlon. In order to Conserv( the use ofthis water or grinding emulsion, a water trough is formed in the machineframe 12 between the work supporting table 14 and the wheel spindlecarriage 26 to collect and draw olf the emulsion. Due to the corrosiveaction of the water, and more particularly of ingredients such ascaustic soda in the grinding emulsion on the highly polished operatingportions of the machinery, and due to the injurious effects of the wateror emulsion on the oil film protecting the bearing surfaces in themachine, it has been found necessary to shield very carefully thevarious portions ofthe machine which are likely to come in contact withthe emulsion. It is of the greatest importance to protect adequately thebearing surfaces of the ways 16 and 28 on which the work supportingcarriage and the wheel spindle carriage are respectively mounted toslide. To this end, a laterally and upwardly extending slot 48 isprovided on each side of the work supporting table 14 and is adapted toreceive a corresponding flange or late 50 formed on correspondingportions of the frame 12 adjacent to the ways 16. In this manner, anysputtering of water or emulsion is effectively prevented from vreachingany of-the operating parts of the machine. located within or beneath thework supporting table. Y Y Y In order to protect the ways 28 for thewheel spindle carriage 26 and other operatthese guards being, sodesigned that they fold up into a comparatively small compass as thewheel s indle nears the end of its travel in either` 'rection.

With the present construction of the machine, which includes apassageway for the lubricating medium and a housing for the cross feedscrew, it has been found impracticable to provide a single ard member toprotect the forward end o theways, since such a member would necessarilybe comparatively large, and would extend well into the water trough asthe wheel spindle carriage reaches the limit of its forward move ment,bringing the guardrinto interference with the housings for the feedscrew and oil conduit.

In carrying out the several features of the.

present invention, a comparatively short upwardly extending guard 52,which extends laterally of the machine across the width of the wheelspindle carriage, is pivoted at 54 on the machine frame 12, and isadapted to rest against the forward ends of the ways 28 for lthe'iivheelspindle carriage. Overlying the guard 52 is a second guard 56 which ishung rom pivots 58 formed on the wheel spindle carriage 26. With thewheel spindle carriage in its foremost position, in Contact with thework, the guard 56, as best shown in Fig. 1, extends downwardly to apoint substantially opposite the pivot 54 of the guard 52, just abovethe trough 46. The edges of the guard 56 are turned over to giveadditional protection to the exposed machine parts. A tension spring 60,secured at one end of a pin 62 on the machine frame and at its other endbeing attached to the turned over edge of the guard 56, tends to holdtheguard yieldingly in contact with the end guard 52 and to hold the twoguards against the ways 28. Adequate protection is provided for the rearend of thev ways 28 by a single guard 64 which is pivoted at 66 to therear end of the wheel spindle carriage 26 and is slidingly supported onthe fixed portion ofthe machine by the engagement of the turned overedges of the guard with rolls 68 mounted on each side o the machinebase.

With the grinding wheel spindle carriage retracted to the limit of itsmovement away from the work, the rear guard 64 willbe permitted to hangin a substantially vertical position as its pivotal support 66 is movedto the rear of the rolls 68. The guards 52 and 56 at this time willoccupy an 4extended position, the guard 56 which is carried rearwardlywith the carriage 26 being held tightly against the upper edge of theower guide 52 resting on the forward ends of the ways 28 by means of thetension spring 60. As the wheel spindle carriage is advanced during thegrinding operation, the rear guard 64- will be drawn forwardly with thecarriage being supported on the rolls 68. As the pivot 58 for theforward guard 56 is advanced, the guard is held at all times in contactwith the lower guard 52 by the pressure of the spring 60. In the mostadvanced position of` t e carriage, as shown in Fig. 2 of the drawings,the lower guard 52 has been swung forward beyond center by engagementwith the projecting-portions of the wheel spindle carriage 26 and restsyieldingly against the upper guard 56 which is held in its limitingvertical position by the spring 60.

The invention having been described, what is claimed is:

1. A. grinding machine having, in combination, a work table, -a grindingwheel a wheel spindle carriage, a water trough tween the table andcarriage, a bed provided with ways for the carriage andguards to preventthe water from coming in contact with the ways comprising a guardpivotally mounted on the machine frame adjacent the edge of the watertrough, and a guard overlapping therewith in all positions of thecarriage pivotally mounted on the carriage.

2. A grinding machine having, in combination, a work table, a grindingwheel, a wheel spindle carriage, a water trough between the table andcarriage, a bed provided with ways for the carriage and guards toprevent the water from coming in contact with the ways comprising aguard pivotally mounted onl the Ways et one end of the carriage, and a.guard pivotally mounted on the carriage and 'projecting over the 'waysat the other end of the carriage.

ft grinding machine having, in combinntion, e `Work table, e indingwheel, a 'wheel spindle carriage9 a d provided with tor the carriage, o,water trough between the table .endl the carriage, and guards mit to)prevent the Water from coming in eontact with the Ways and underlyingparts comprising; n, guard extending iaterall of the maonine ncross thetorward end o the carriage "oirotntty mounted on the machine frame ndiWoont the enige oi the Water trough and snp- `porter-i. in nsubstantially upright position niinst ndjncent portions ot the machine,:a ignoro! orertnpping therewith in eti the po :ions ot the carriagepvotelty mounted on the carriage, and spring means acting on the tntterguardi to hold the guards yieltin 1y :in `eozntnot with each other andwith underying portions ontm the machine.

tn testimony whereof I have signed my onine to this. s ecieation..

Mn WELL i. MATHEWSON

